x402 is an open internet-payment protocol that integrates stablecoin payments directly into web infrastructure. Named after the HTTP status code 402 Payment Required, x402 transforms this placeholder into a functional standard for frictionless micropayments across APIs, content, AI agents, and data access.
The protocol is chain-agnostic and designed for seamless integration: a client requests a resource, the server returns HTTP 402 with payment requirements, the client pays via x402 headers, and access is granted upon verification. No complex onboarding, no user registration—just pure, frictionless value transfer.
Backed by industry leaders including Cloudflare and Coinbase through the x402 Foundation, this protocol is positioned to enable the next generation of internet commerce and the autonomous machine economy.
Works across multiple blockchain networks with stablecoin support for consistent value transfer.
No user accounts, no complex setup. Just instant payments integrated directly into HTTP workflows.
Built on open protocols and standards, ensuring interoperability and widespread adoption.
From API monetization to autonomous agent economies, x402 enables seamless value transfer across the internet.
Enable pay-per-use pricing for APIs with zero friction. Developers can monetize endpoints instantly without complex billing infrastructure.
Autonomous agents transacting seamlessly without human intervention. Enable machine-to-machine payments for the future of automation.
Frictionless paywalls for digital content. Readers pay only for what they consume, creators get instant settlement.
Real-time data access with instant settlement. Buy and sell data streams with per-request pricing and immediate payment.
Connected devices making autonomous payments for services, bandwidth, and resources without human oversight.
In-game purchases and virtual asset trading with instant settlement and cross-platform compatibility.
x402 is supported by leading technology companies and the open-source community.
Infrastructure Partner
Global edge network powering x402 protocol distribution and performance.
Payment Infrastructure
Stablecoin settlement and blockchain integration for seamless transactions.
Protocol Governance
Open-source stewardship and community-driven protocol development.
Documentation, guides, and insights to help you build the future of internet payments.
Technical Guide
Deep dive into the HTTP 402 status code and how x402 brings it to life.
Documentation
Get started with x402 in minutes. Complete integration guide with code examples.
Whitepaper
Exploring the future of AI agents and autonomous economic systems powered by x402.
Technical Guide
How to implement chain-agnostic stablecoin payments in your applications.
Announcement
Learn about the x402 Foundation, our partners, and the protocol's future direction.